To cite Amelia in publications use:

Honaker J, King G, Blackwell M (2011). “Amelia II: A Program for Missing Data.” Journal of Statistical Software, 45(7), 1–47. http://www.jstatsoft.org/v45/i07/.

Corresponding BibTeX entry:

  @Article{,
    title = {{Amelia II}: A Program for Missing Data},
    author = {James Honaker and Gary King and Matthew Blackwell},
    journal = {Journal of Statistical Software},
    year = {2011},
    volume = {45},
    number = {7},
    pages = {1--47},
    url = {http://www.jstatsoft.org/v45/i07/},
  }